A Vestavia Hills doctor indicted on federal child pornography charges is accused of filming teen girls undressing in his pool house without their knowledge and possessing commercial pornography depicting what experts categorized as a rare amount of sexual violence.

New details in the allegations against 55-year-old Dr. Ronald Tai Young Moon – who lives in Liberty Park and up until his arrest practiced at his clinic in Birmingham – emerged Friday in a federal court hearing to determine whether the embattled physician will be released on bond.

The FBI investigated the case, which Assistant U.S. Attorney John B. Ward and First Assistant U.S. Attorney Lloyd C. Peeples, III are prosecuting. Moon’s defense team includes James Parkman, William White and Clayton Tartt.

Federal prosecutors contend Moon, a husband and father of three who has remained in custody since his arrest, is a flight risk and a danger to the community. Moon’s defense team, however, argued that if he was going to flee from prosecution, he would have already done so and said the pornographic VHS tapes recovered from his office were filmed at least a decade ago.

U.S. Magistrate Judge John H. England III has not yet issued a ruling on the detention issue.

Moon was arrested June 4 on charges of producing and possessing child pornography, according to a joint announcement by Northern District U.S. Attorney Jay E. Town and FBI Special Agent in Charge Johnnie Sharp Jr. The two-count indictment against Moon was filed last week. Authorities said Moon is a physical medicine doctor who practices at a clinic called The Industrial Athlete in the 800 block of University Boulevard. His patients, authorities say, include adolescent athletes.

According to the practice’s Facebook page, Moon treats patients in osteopathic manual techniques and treatment of musculoskeletal disorders. As part of his holistic practice, Moon offers Suboxone treatments to help fight opioid dependency.

Moon is charged with producing child pornography sometime between 2007 and 2010. He also is charged with possessing child pornography on or about January 15 of this year.

Federal investigators in mid-January raided The Industrial Athlete as part of an ongoing probe into health care fraud. He has not yet been charged with any fraud-related crimes. However, it was during that search warrant that investigators found 27 VHS tapes in Moon’s private office at The Industrial Athlete alongside a television-VCR combination. Authorities also found evidence of covert cameras and instruction manuals for the cameras, according to testimony at the detention hearing.

The tapes were not shown at the hearing but FBI Intelligence Analyst Tina Mauldin, who has worked in that capacity for 25 years and examined “hundreds of thousands” of child pornographic images, testified as to what she saw on the tapes seized from Moon’s office.

Of the 27 tapes, Mauldin said, 25 of them contained pornography. Of those 25, about six or seven involved “child pornography.” She said the view on those tapes was from a camera hidden in a residential bathroom, alleged to be at Moon’s home on Reynolds Lane in Liberty Park. The videos, she said, involved young teen girls changing into and out of their bathing suits. At times they were naked, and their breasts and genitalia visible on the recordings. Some were also seen going to the bathroom.

One of the recordings, she testified, shows Moon walking into the bathroom and looking directly at the camera. She said he was clearly identifiable in the image.

Mauldin said investigators identified five of the teen girls and interviewed them. The girls were able to identify themselves and each other in recordings, she said, and all said they had no idea they were being recorded. They had attended a pool party at his home. They were shown the images of the man that appeared in the same bathroom and identified him as Moon.

Mauldin also testified to other records described by authorities as voyeuristic. They involved two different families and appeared to have been recorded at night and from outside of a window into the homes. Both adults and children were seen naked in those recordings and also were unaware they were being recorded in various stages of undress.

As for commercial videos recovered from Moon’s office, Mauldin testified they included “bondage, torture, beating, rape, electrocution of genitals, attempted drowning, suspension from the ceiling, forced eating of feces and forced drinking of urine.”

Under questioning by prosecutors, Mauldin said those recordings depicted “the worst violence I’ve ever seen,’’ in her career as an FBI analyst. She said of the hundreds of thousands of pornographic images or recordings she’s examined, those in Moon’s possession rose to “a rare level of violence.”

Under cross examination by the defense, Mauldin said none of the six or seven recordings of the girls portrayed them involved in any sexual activity, nor were they “positioned” in a provocative manner. Parkman also questioned the analyst as to whether any pornography was found on Moon’s phone, and she said she was not aware of any.

During interviews with the teen girls, Mauldin said, none said Moon had ever acted inappropriately toward them and “they were complimentary of him.”

Special Agent Jeff Inman of the Office of Inspector General, U.S. Department of Health and Human Services, testified about affidavits obtained from at least two of Moon’s former employees, both of whom left after the January raid at the clinic. One of the ex-employees, he said, reported that Moon tried to get her to sign her name to an affidavit about practices at the clinic, but she told authorities that some of the statements in an affidavit presented to her were untrue. The statements, Inman testified, included that Moon never took patient charts home, never treated patients outside of the office, and always spent a considerable amount of time with a patient before prescribing medication, which often included opioids. The employee refused to sign the affidavit and contacted an attorney.

Patsy Weaver, a longtime employee of Moon’s – who had worked with him or for him since 1997 – testified that the employee who refused to sign the affidavit was “disgruntled” because a new employee had been hired at a higher rate of pay. Parkman contended through questioning that the first former employee was upset with Moon because he had previously denied her access to her 401K for a family emergency

A second former employee, Inman testified, was also asked by Moon to sign an affidavit that she felt contained the same inaccurate statements and said she felt pressured via phone calls and texts from Moon to sign the affidavit.

Prosecutors said Moon should remain in custody because he has the means and motive to flee, especially since the sentencing guidelines could land him in prison for life if he were to be convicted. Ward also said Moon presents an ongoing danger to the community because the evidence shows he is still “using and accessing” the pornography found in his office. “It was not found in a dusty attic boxed away,’’ Ward said.

Parkman said his client has obviously been aware of the investigation since the January raid and has not gone anywhere. His family has strong ties to the community, he said, and pointed to 25 letters of support for Moon that were admitted into evidence. Also, about 50 friends and family members, including Moon’s wife, packed the courtroom for the duration of the lengthy hearing. “This shows the community support of him,’’ Parkman said. He also added, “We do claim our innocence very strongly.”

The attorney said they would abide by any restrictions the judge might impose on Moon should he be released, but added that he hoped his client would still be able to see his son’s lacrosse games.

England said he had a lot to consider and wanted an inspection of Moon’s home before possibly releasing him pending trial. He did not say when that ruling would come, and Moon remains in the custody of U.S. Marshals.